Restricted Investment In Bank Stocks (Details)	3 Months Ended
Mar. 31, 2018
FHLBP [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Maximum percent of member's total capital stock outstanding available for repurchase	5.00%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration